It's still too easy to buy guns illegally on the social media site.

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With 128 million daily users in the United States, Facebook is basically the great gun bazaar -- want to buy a gun but can't get one legally? There's an app for that.

I'm a casual Facebook user but my daughter has 1,026 friends and another 297 followers on Instagram. And each of her friends has about the same number. Even a back-of-the-envelope calculation shows the potential for connections on social media is simply staggering, and with a billion users, so is the potential for some dark corners where illegal things can happen.

That's why it's important that Facebook does the right thing when it comes to guns. Recently, in response to calls to simply prohibit gun sales on Facebook, Mark Zuckerberg's company underwhelmed many people by ducking the issue of illegal gun sales on his site, despite the great fanfare with which it touted the news.

Facebook's new policy still makes it too easy for dangerous people to avoid background checks. And, the company has failed to meet the bar set by other prominent websites including Google, Craigslist, and eBay who all prohibit unlicensed sellers from advertising guns for sale. Unlike these other sites, Facebook will continue to allow unlicensed sellers to post guns for sale but at the same time prohibit paid advertisements for guns. So you can't pay to advertise guns for sale, but you can do it for free.

Gun sellers and enthusiasts have already begun offering tips on the Facebook gun fan page on how to circumvent the new rules. They get that Facebook basically said, "Okay, we don't want users to buy guns without Brady background checks, so we'll warn violators to comply with local laws and then let them self-police."

On what planet will this prevent anything? It'd be like me telling my 16 year-old to turn himself in if he drove too fast or asking one of his friends to tell me if he went somewhere he shouldn't. It's simply not going to happen.

It's unrealistic to pass the responsibility of policing to users. I could try 24/7 but it's unlikely I'd be effective because I'm not qualified: I'm not a police officer and I don't have the technical know-how or the time. Even if I catch a post about selling a gun, it'll still be permissible within Facebook's policy guidelines as long as the post doesn't outright say something like 'no background check needed.'

You're a criminal, domestic abuser or terrorist and want a gun without a Brady background check? Just join Facebook. You're not 18? Just lie when you sign up like the 39% of teens who admitted to doing just that, according to a Pew survey, May 2013. They're not checking.

Zuckerberg and his wife Priscilla Chan don't have kids yet, but when they do they'll understand that they can't do everything for Zuck Jr. No matter how hard they try or how involved they are, they'll know how difficult it is to police 100% of his or her activities on social media; they'll need help from sites like Facebook, which certainly has the brains and the brawn and the moral responsibility to keep kids -- and everyone else -- safe when it can.

Should I be happy that the social media giant did something, rather than nothing? Sure, Facebook gets partial credit but if I was still teaching middle school they'd get an incomplete -- because that's what this announcement really means.

When 40% of gun sales occur through unlicensed sellers (likely without a background check) and fuel a thriving criminal gun market, it's time to act and not just rely on users being some sort of online neighborhood watch.

The online gun market is real, as are its victims. Jitka Vesel was gunned down by a stalker in the parking lot at the Chicago museum where she worked; her killer illegally obtained his gun from an online posting. Zina Daniel and two others were shot and killed by a man who, also, could not legally obtain a gun but found his unlicensed seller on the Internet. No questions asked.

The grave risk that online gun postings will lead to no-check sales -- and to tragic deaths like Jitka's and Zina's -- led Craigslist, eBay, and Google all to prohibit postings for gun sales. Facebook prohibits bullying, hate speech, and postings that encourage eating disorders or self-mutilation. In announcing these policies, the social network proclaims that "Safety is Facebook's top priority." But Facebook has refused to follow the simple, straightforward, common sense policy of its fellow Internet giants. Facebook has continued to allow unlicensed people to post gun sales and is still the great gun bazaar.

Nine in 10 Americans support universal background checks for gun purchases. As the most influential social network, Facebook should listen to its constituents and seize the moment: Prohibit unlicensed gun sales. Until Brady background checks are required for all gun sales, it is inevitable that online posts will result in no-check -- and sometimes illegal -- firearms sales to felons, domestic abusers and other dangerous people.

Heidi Yewman of the Million Mom March/Brady Campaign is author of Beyond the Bullet: Personal Stories of Gun Violence Aftermath.

In addition to its own editorials, USA TODAY publishes diverse opinions from outside writers, including our Board of Contributors. To read more columns like this, go to the opinion front page or follow us on twitter @USATopinion or Facebook.

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